Connecting collar for furnaces



Patented Sept. 15, 1925.

UNITED STATES PATENT oFFlcE.

oF MARSHALLTOWN, IOWA.

CONNECTING COLLAR FOR FURNACES.

Application filed November 2,4, 1924. Serial No. 751,962.

To all whom t may concern:

YBe it known that I, JAMES VRBA, a citizen of the United States, and a resident of Marshalltown, in the county of Marshall and State of Iowa, have invented a certain new and useful Connecting Collar for Furnaces, of which the following is a specification.

In the construction of hot air furnaces, it is customary to have a heat or combustion chamber and also a radiating drum slightly spaced apart from the yheating chamber in the rear thereof and within the furnace casing, and in such construction there` is customarily provided a so-called connecting collar through which the products of combustion from the heating chamber may pass to the radiating drum and from there to the chimney. In the construction of steel furnaces, these connecting collars'are usually made of cast metal and must be connected to both the heating chamber andthe radiating drum in a strong, durable and air-tight manner, and they are usually made in two parts so that the radiating drum with its part of the connecting collar may be detached. Heretofore great difficulty has been experienced in providing suitable connection between the part of the connecting collar attached to the radiating drum and that part that is attached to the heating chamber, and various expedients have been provided for this purpose.

The object of my invention is to provide an improved connecting collar of simple, durable and inexpensive construction that may be readily, quickly and easily made 'of cast iron by the ordinary moulding process, and in which the radiating drum with its collar member may be readily, quickly and easily attached to that part of the connecting collar applied to the heating chamber, and there firmly and innnovably held in proper position without the vuse of bolts, screws or other fastening devices; and also in this connection to provide a form of jointA or connection between the two collar members to which cement or other packing ma-l terial maybe readily and easily appliedL to form a substantially air-tight joint.

My invention consists in the construction, f

arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in my accompanying drawings, in which:

Figure l shows a perspective view illustrating a portion of the heating chamber and a' portion of a radiating drum connected J0-- Figure 4 shows a vertical sectional view f on the line 4 4 of Figure 3, illustrating the collar member for the radiating 'drum and omitting the collarmember for the heating chamber; and

Figure 5 shows a perspective view illustrating the collarmember for the heating chamber.

Referringv to the accompanying drawings,

' I'have usedvthe reference numeral l0 to indicate the heating chamber and 11 the radiating drum. yThe yconnecting collar is made in two parts, each formed of a single casting. That part of the connecting collar which is to be connected to the heating chamber comprises a flange 12 shaped to surround an opening formed in the upper rear end of the heating chamber and provided with rivet openings by which it may be secured to the heating chamber.

' Extended rearwardly from the iiange l2 is the collar member 13. y'At the bottom of the member 13 there is a flange projected rearwardly indicated bythe numeral 14, and tapered' on its' uppei` surfacev down- 13 are the locking wedges 18.

wardly and rearwardly, and its upper edge is inclined from the rear vupwardly and toward the heating chamber at 15. The upper portion of the part 13 and the sides thereof are formed with a shoulder at 16, and projecting rearwardly from this shoulder is a flange 17, the top of which is inclined downwardly and rearwardly, and its sides are inclined rearwardly and toward each other, the latter inclination being clearly shown in Figure 2, and, as will be seen by referring to Figure 5', ythe flange 14 projects rearwardly further than the flange 17 Formed on the side walls of the member These wedges, as will be seem; are spaced apart forwardly from the shoulder 16 and are preferably east integrali with the member 13".

The collar member thatis attached to the radiating drum comprises a flange 19V provided with rivetopenings and designedto be riveted to the front upper portion ofthe radiating` drum surrounding an opening therein. At its bottom portion there is a forwardly extended flange 20 to be received into the flange 14, and at the base of this flange' 2O there is ay shoulder 21 designedto engage the rear edge of the part 14. At its .sidesabove kthe flange 20- there is a shoulder 22 shaped and inclined to rest upon the inclined shoulder 15. At the top of the collar member for the radiating drum there is a flange 23 designed to` rest on topand fit against the inclined flange 17 and against theshoulder 16, and at the baseof this flange 23l at the top there is a shoulder 24 against which the rear edge of the flange17` engages. At the sides of the radiating drum there are two wedge lock devices,- each comprising a forwardly extended flange-25 and an inwardly extended flange 26,` thus forming a recess to receive the wedgeY lock. member `18, the top of the wedge lock member being closed at 27, as shown in Figure 4,; The entire body of this wedge lock member on the radiating drum collar member projects forwardly beyond the flanges 23, as shown in Figure 4.

In practical operation,it is obvious that the entire connecting collar may be read-ily and easily cast in twor parts with the use of simple patterns in the ordinary manner. Each part is then permanentlyconnected` by rivets or boltsto the corresponding part o'f the furnace. Then a cement or packing ma; terial is placed upon the upper surface of the flange member 14 andv on the upper surface of the flange member 17 and upon the outer sides of the flange member 17, then the radiating drum kwith its' connecting member attached thereto is placed in position with the connecting `member thereon just above the connecting member on the heating chamber. It isthen moved downwardly with the wedge lock members 18 inorpacking material inserted between them until a ygas and air-tight fit is made. Further downward movement is then limited by the shoulders 22. engaging the shoulders 15,

all of which may obviously be done very quickly and there ris no need? of any bolts, rivets-y or similar fastening devices. Furthermore, theparts are heldv together in such` manner that the radiating drum cannot move in any direction relative to-the heating chambers. j

Inthis connectioinl obtainl a v ery marked advantage by having the wedgey lock devices entirely spaced apart from the tapered flanges,` because if thel wedge loc-k devices were applied atthe surfaces. ofthe tapered flanges,Y it would be difficult toobtainsmooth castings; andfurthermore, it would be almost impossible to properly apply cement or other packing material completely'surrounding the joint between the twol connecting members, assuchwedge lockdevices would interfere with theupacking or cement.

I claiml as my invention:

1. AV connecting col-lar ofthe class 4described, comprising` in combination two col-V lar membersy formed with coacting, tapered flanges', said col-lar members being also formed with-coasting. wedge lockV devices applied.` thereto atV points spaced apart from said tapered flanges.

2. A connecting. collar of the -class described,- comprising a collarv member Yformed witha rearwardly extended flange at its bottom and the lower portionof said yflange havingpits upper surface `and theY inner surface of its sides inclined 'toward the rear, said collarv also` beingy formed with a flange at itstopQ and the upper portions of its side having the outer` surface thereof inclined downwardly and rearwardly, the lower flange being projected rearwardly to a greater distance Vthanthe upper flange,` and there being a shoulder formed between ther-n, and wedgef devlicesfformed. integral with a flangefat the'sides thereof and spaced forf ward-ly from said upper flange; member, and a coacting-collarY member yhaving at its top and the uppei'portion of its sides a forward-ly extended flange, with its. lower edge inclined forwardly` and upwardly, and the edges of` its sides inclined .forwardly and outwardly, and also having at the bottom and lower portion of its sides-a flange with its bottom inclined forwardly and upward- 1y, and the adjacent portions of its sides inclined forwardly and inwardly7 there being shoulders at the intersection of said flanges, said upper flange being projected forwardly to a greater extent than the lower flange, and wedge lock devices at the sides of the collar member projected forwardly beyond the upper flange member and being designed 10 to receive the wedge lock devices on the other collar member, substantially as set forth andfor the purposes stated.

Des Moines Iowa, November l, 1924.

JAMES VRBA. 

